| Autor: |
DEY, M, GUIONNEAU, P, HINGE, VK, RAO, CP |
| Jazyk: |
angličtina |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
IndraStra Global. |
| ISSN: |
2381-3652 |
| Popis: |
This paper deals with the development of a receptor with selectively functionalized at the lower rim of p-tert-butyl calix[4] arene linked through amide bond, resulting in the diamide derivatives (L-1, L-2 and L-3) suitable for sensing ions and molecules. All the derivatives were thoroughly characterized by analytical and spectral methods. These derivatives were structurally characterized by single crystal X-ray diffraction and the conformational features of the calix[4] arene as well as the pendants are discussed. The L-1 and L-2 exhibited intramolecular hydrogen bond interaction between the N-H and the lower rim phenolic oxygen in addition to the circular hydrogen bonding between the phenolic O-H and the ether oxygen of the adjacent strand. The corresponding H-bond is absent when no 'H' is present on amide-N as in case of L-3. Such intramolecular N-H center dot center dot center dot O interactions observed with the pendant results in a conformational bend responsible for the orientation of the arms and there by the nature of the binding core formed. Thus the binding cores formed differ largely between L-3 and the other two. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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